Katy Perry is getting over her recent split with John Mayer by hitting the club scene. The “Firework” songstress was spotted fooling around with a large group of friends at Laurel Hardware in Los Angeles on Wednesday night. “She was taking photos of her pals,” says a spy. “She seemed fine and happy. She hung in the back of the club, behind the bar, and stuck with her friends all night. She left after two hours.” Perry and Mayer were reportedly dating for just a few months.